Marcomanni

The Marcomanni were a confederation of Germanic tribes from Bergium in present-day western Germany. Descended from the Suebi tribe, the Marcomanni tribe fought against the Roman Republic and Roman Empire on the Rhine River, and Emperor Marcus Aurelius fought a series of wars against them.

History
For decades before 41 BC, the Germanic Marcomanni confederation coveted the bountiful lands of Gaul. Their fathers spoke longingly of the year spent settled there alongside the Suebi, before Caesar responded in defense of Rome’s new province and drove them back across the Rhine. A highly mobile people, the Marcomanni were renowned for exploiting weakness as soon as it was shown. After Caesar died in 44 BC, and his successors were at each other’s throats, just such a weakness had presented itself. The Marcomanni fought against Octavian's Roman Republic after they attacked thir Belgae allies, and the Roman Empire fought several wars against the Marcomanni, notably under Marcus Aurelius.